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" n usefnllmprfovements inMillstne-Bail Attach-1 1` pi amis y "ments,whichl inventon'is fullyset forthiii the i annexed specification, inwhich- L "1 y I Figurelis a half- Sectional side elevation, Fig. 2 asectional end elevation, andzlvign `plan view, of a millstone-bail,showingfmy de l vice attached thereto`. Figs). 4 5,; and `6 are"speotive view of the driver.

views of the yoke detached. Fig. 7 i's ai peri Fig. 8 is a'perspectiveview, showing themethod oi' attaching the device to an ordinary bail.

This inventionrelates to the bails bywhich the runner-stone in mills issupported; and

. consists'in pivoting in said bail a yoke or frame having inclinedlugs, with or. without'frictionupon the spindle, by which meansthcfrunner is made self-adjusting in any direction, whether the bail betrue ornot. i

A is the bail, pivoted,;in `the usual manner, upon the spindle B by thecockeye and' head a b. G is a yoke or frame encircling the spindle B,andhaving upon either side trunnions c c', cast in one piece therewith.These trunmons are provided with boxes d d', which are' secm'edin-`sockets orl recesses ere in the interior of the bail, `near the bottom.

`g g are two lugs or bearings cast upon the lower side of the trunnionso c', and project.

`ing downward and outward at an angle of about forty-jive degrees;`These bearings are provided with friction-rollers h h', and set betweenthe jaws il M314 of the driver D. (See Figs. l andlS.) This" driver Dhas the usual elongated slot 7c, throng which the flattenedneck'of thespindle B passes. Y

v It will be readily seen that-when the driver is-revolved thebailwll becarried with it,

4thus operate the runner.`

i acquainted.

A( through the y bearingsfg and yoke 0,) `and By this `arrangementIaccolnplish many inrportant results not obtained by the old style ofdriver, or any attachment withwhich l, am It is a well-known fact 'amongmillers thatn it is almost-an impossibility to set a bail in a 'besetperfectly; true.; but i the; hail, bingiset .advantage of y any device`whichpwill obviate low it to have free play aboutthe neck of "thedirection.

. rollers, which project downward'at an angle Vand are acted upon-by adouble-jawed driver met @was osltiO be maar., not; p

f The drivers q remade b by"had..isfofnmajoretteand bien reni ders itnecessarytoreutthe stone; A hence the this difficulty.

The yoke will `be made large enough tofal-f i spindle, to enable thestone to move .in` anyff n By using a double-j awed driver,"D, the same1F- yoke maybe useduponraburr running with or against `the sun. Theyoke,`trunnions, and bearingsfor the friction-rollers may be cast. i`

in one piece of steel or'iron. -7 The yyoke may be contracted into a rodand :made to pass-v `through a large hole in the neck of the spiny dle;but Iprefer it arrangedlas shown. v

The yoke 'will bednade of? an oval form through its cross-section, asfinthe drawing,`

so that its sharp edge will prevent grain from lodgingbeneath it uponthe driver and form a false bearing,n and throw the runner out of y.true. It will also prevent grain lodging upon- ,n its top.

I am acquainted with severaln styles ofiati"` tachments and drivers, butnot arranged like miner-f.` W

v `The patent of Wells Sargeant, November 30, `1875, No. 170,454, showsa bent shaft passi .y

fing through the neck ofthe spindle, and securedby boxes "to thedriver," but this is simy ply "intended toovercome any imperfections i,that may exist inthe driver, andhas', and can j y y have, no effectupon the upper stone to true it.

v My device is for an entirely dierent object, and is arranged in anentirely different manner.

ITam also acquainted with the patent of W. l S. Bacon, December 29,1874, No. 158,192, who shows'arecessed bail having a single-horned,driver working therein, but his invention is simply and only a slightvariation of the old The frame E may be made -in two parts, if

desiredwith one box, m, in each piece.

By this simple and inexpensive device the yoke may be readily attachedto any-ordinary the friction-rollers h h', the several parts conbailwithout in 'the least changing any part, not even the driver, as thebearingsy g g will work in the ordinary slip-driver, it beinglsimplycnecessary to turn the driver at right angles to the bail; but theaction will be the same. c I am aware that transverse rock-shafts havingcrank or bent ends and a central eye or x yoke passing around the,spindle instead of through it are old, nor do I claimsuch as myinvention. l

Having thus described my invention, what `2 y v A198,732

I claim as new, and desire to secure by Letters Patent, isv 1. Thecombination, with the yspindle, bail, and driver, of the pivoted yoke(l, having the trunnions c c', provided with the downwardly andoutwardly inclined bearings g g', the several parts constructed andrelatively arranged to operate substantially in the manner specified.

2. The combination, with the spindle, bail, and driver, of the pivotedyoke C, having the trunnions c c', provided with the downwardly andoutwardly inclined bearings g gv', having structed and relativelyarranged to operate substantially in the manner specified.

In testimony whereof I have hereunto set my hand in vthe presence of twosubscribing witnesses. l

Witnesses: y C. N. WoonwARD, JOHN T. Hansrrnn.

Anvn H. KIRK.'

